Patents by Inventor Yohei Ishikawa

Yohei Ishikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12280357
    Abstract: Adsorbent particles each containing: a carrier particle containing an organic polymer containing a monomer unit derived from a styrene-based monomer; a hydrophilic organic compound adhered to a surface of the carrier particle; and a diglycolic acid residue bonded to the hydrophilic organic compound. When a BET specific surface of the adsorbent particles as determined by adsorption of nitrogen gas is X0 and a BET specific surface area of the adsorbent particles as determined by adsorption of water vapor is X1, X1/X0 is 0.10 to 1.0.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: April 22, 2025
    Inventors: Masahiro Aoshima, Yohei Ishikawa, Masaru Watanabe
  • Publication number: 20230405553
    Abstract: Adsorbent particles including: porous carrier particles containing an organic polymer; polyethylenimine attached to a surface of the porous carrier particles; and a diglycolic acid residue bonded to an amino group of the polyethylenimine. A most frequent pore size of the porous carrier particles exceeds 10 nm.
    Type: Application
    Filed: October 22, 2021
    Publication date: December 21, 2023
    Inventors: Masahiro AOSHIMA, Yohei ISHIKAWA, Masato MIYATAKE
  • Patent number: 11556070
    Abstract: According to the present invention, there is provided a carrier core material that is formed of ferrite particles in which 48 to 52 mass % of Fe, 16 to 22 mass % of Mn, 1.0 to 3.5 mass % of Mg and 0.05 to 0.5 mass % of Ca are included, and when an electrical resistance value with an applied voltage of 500 V in an environment (in an L/L environment) in which the temperature is 10° C. and the relative humidity is 35% is RL (?·cm), and an electrical resistance value with an applied voltage of 500 V in an environment (in an H/H environment) in which the temperature is 30° C. and the relative humidity is 70% is RH (?·cm), formula (1) below is satisfied. 0.1?(log RL?log RH)?0.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: January 17, 2023
    Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Takeshi Kawauchi, Yohei Ishikawa, Hiroyuki Miyano
  • Publication number: 20220305457
    Abstract: Adsorbent particles each containing: a carrier particle containing an organic polymer containing a monomer unit derived from a styrene-based monomer; a hydrophilic organic compound adhered to a surface of the carrier particle; and a diglycolic acid residue bonded to the hydrophilic organic compound. When a BET specific surface of the adsorbent particles as determined by adsorption of nitrogen gas is X0 and a BET specific surface area of the adsorbent particles as determined by adsorption of water vapor is X1, X1/X0 is 0.10 to 1.0.
    Type: Application
    Filed: June 12, 2020
    Publication date: September 29, 2022
    Inventors: Masahiro AOSHIMA, Yohei ISHIKAWA, Masaru WATANABE
  • Publication number: 20220219139
    Abstract: Disclosed are adsorbent particles each containing: a carrier particle containing an organic polymer; an amino group-containing polymer adhered to a surface of the carrier particle and including a constituent unit having an amino group; and a diglycolic acid residue bonded to the amino group of the amino group-containing polymer.
    Type: Application
    Filed: February 25, 2020
    Publication date: July 14, 2022
    Inventors: Masahiro AOSHIMA, Yohei ISHIKAWA, Masaru WATANABE
  • Publication number: 20210132520
    Abstract: According to the present invention, there is provided a carrier core material that is formed of ferrite particles in which 48 to 52 mass % of Fe, 16 to 22 mass % of Mn, 1.0 to 3.5 mass % of Mg and 0.05 to 0.5 mass % of Ca are included, and when an electrical resistance value with an applied voltage of 500 V in an environment (in an L/L environment) in which the temperature is 10° C. and the relative humidity is 35% is RL (?·cm), and an electrical resistance value with an applied voltage of 500 V in an environment (in an H/H environment) in which the temperature is 30° C. and the relative humidity is 70% is RH (?·cm), formula (1) below is satisfied. 0.1?(log RL?log RH)?0.
    Type: Application
    Filed: March 15, 2018
    Publication date: May 6, 2021
    Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Takeshi KAWAUCHI, Yohei ISHIKAWA, Hiroyuki MIYANO
  • Patent number: 10759937
    Abstract: A polyketone composition includes: (A) a polyketone having, in a main chain, a structural unit represented by the following Formula (I); and (B) an epoxy compound. In Formula (I), X represents a bivalent group that has from 1 to 50 carbon atoms and that may have a substituent group, Y represents a bivalent hydrocarbon group that has from 1 to 30 carbon atoms and that may have a substituent group, and n represents an integer from 1 to 1500.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: September 1, 2020
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Hiroshi Matsutani, Nanako Mizuguchi, Satoshi Asaka, Misao Inaba, Yohei Ishikawa, Keiko Kudoh, Katsuya Maeyama
  • Publication number: 20200247948
    Abstract: A polyketone composition contains: a polyketone containing a structural unit represented by the following Formula (I), and inorganic particles; in which a content of the inorganic particle is from 10 parts by mass to 70 parts by mass, based on 100 parts by mass of a total amount of the polyketone and the inorganic particles, and an average particle diameter of the inorganic particles is from 10 nm to 200 nm.
    Type: Application
    Filed: January 15, 2018
    Publication date: August 6, 2020
    Inventors: Hiroshi MATSUTANI, Naoki FURUKAWA, Yohei ISHIKAWA, Masahiro MATSUNAGA
  • Publication number: 20190211141
    Abstract: A polymer includes: a structural unit represented by the following Formula (I-1) and a structural unit represented by the following Formula (I-2). In Formulae (I-1) and (I-2), X and X? each independently represent a divalent group having 6 to 50 carbon atoms and containing an aromatic ring; Y represents a divalent group having 5 to 50 carbon atoms, the divalent group including an alicyclic ring and alkylene groups, and the alkylene groups each having 1 to 10 carbon atoms connecting carbon atoms included in carbonyl groups adjacent to Y with the alicyclic ring; Y? represents a divalent group having 3 to 50 carbon atoms and containing an alicyclic ring directly bonded to carbon atoms included in carbonyl groups adjacent to Y?; and m and n each represent an integer from 3 to 1,000.
    Type: Application
    Filed: May 26, 2017
    Publication date: July 11, 2019
    Inventors: Hiroshi MATSUTANI, Nanako ARIMA, Yohei ISHIKAWA, Keiko KUDOH, Katsuya MAEYAMA
  • Publication number: 20190077951
    Abstract: A polyketone composition includes: (A) a polyketone having, in a main chain, a structural unit represented by the following Formula (I); and (B) an epoxy compound. In Formula (I), X represents a bivalent group that has from 1 to 50 carbon atoms and that may have a substituent group, Y represents a bivalent hydrocarbon group that has from 1 to 30 carbon atoms and that may have a substituent group, and n represents an integer from 1 to 1500.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 14, 2019
    Inventors: Hiroshi MATSUTANI, Nanako MIZUGUCHI, Satoshi ASAKA, Misao INABA, Yohei ISHIKAWA, Keiko KUDOH, Katsuya MAEYAMA
  • Patent number: 10191685
    Abstract: A storage system capable of realizing off-load data copy among storage subsystems constituting an HA pair configuration is provided. Therefore, in an HA pair configuration where a first volume of a first storage subsystem and a second volume of a second storage subsystem respectively respond a same virtual ID to the host, when the first or the second storage subsystem receives an instruction of off-load data copy specifying a virtual ID as the copy destination from the host computer, either a first volume or a second volume is selected as a copy source volume according to a position of a copy destination volume, and data is copied from the selected copy source volume to the copy destination volume.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: January 29, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Yohey Ishikawa, Hideo Saito, Tomohiro Kawaguchi, Ken Tokoro, Keishi Tamura, Abhishek Johri
  • Patent number: 10140035
    Abstract: A storage system according to one preferred embodiment of the present invention is composed of at least a first storage subsystem and a second storage subsystem. Write data from a host computer is duplicated to a first volume of the first storage subsystem and a second volume of the second storage subsystem, and the host computer is composed to be able to access both the first volume and the second volume. Attribute information which is information related to an order of write and/or write capability is set for each volume, and when an access command to the volume is received from the host computer, the storage subsystem determines whether I/O to the first volume and/or the second volume is required or not based on the attribute set for each volume.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: November 27, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Tomohiro Takei, Yohey Ishikawa, Hideo Saito, Ken Tokoro, Keishi Tamura, Tomohiro Kawaguchi
  • Patent number: 9964878
    Abstract: A carrier core material is represented by a composition formula MxFe3-xO4 (where M is Mn and/or Mg, and X is a total of Mn and Mg and is a substitution number of Fe by Mn and Mg, 0<X?1), in which 5 to 20 number percent of bound particles where 2 to 5 spherical particles are bound together are contained and in which the maximum peak-to-trough depth Rz of the surface of normal spherical particles other than the bound particles is equal to or more than 1.5 ?m but equal to or less than 2.1 ?m. In this way, it is possible to increase the amount of toner supplied to a development region, and the surface of a photosensitive member is prevented from being scratched by a magnetic brush.
    Type: Grant
    Filed: March 1, 2016
    Date of Patent: May 8, 2018
    Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Yohei Ishikawa, Shinya Sasaki
  • Publication number: 20180107129
    Abstract: A carrier core material is represented by a composition formula MxFe3-xO4 (where M is Mn and/or Mg, and X is a total of Mn and Mg and is a substitution number of Fe by Mn and Mg, 0<X?1), in which 5 to 20 number percent of bound particles in which 2 to 5 spherical particles are bound together are contained, and in which the absolute value of a difference between lattice constants before and after milling which are calculated from a peak position of plane indices in a powder X-ray diffraction pattern is equal to or less than 0.005. In this way, it is possible to increase the amount of toner supplied to a development region, and even when cracking or chipping occurs in the carrier core material, an image failure such as black spots or white spots is prevented from being generated.
    Type: Application
    Filed: March 3, 2016
    Publication date: April 19, 2018
    Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Yohei ISHIKAWA, Shinya SASAKI
  • Publication number: 20180052405
    Abstract: A carrier core material is represented by a composition formula MxFe3-xO4 (where M is Mn and/or Mg, and X is a total of Mn and Mg and is a substitution number of Fe by Mn and Mg, 0<X?1), in which 5 to 20 number percent of bound particles where 2 to 5 spherical particles are bound together are contained and in which the maximum peak-to-trough depth Rz of the surface of normal spherical particles other than the bound particles is equal to or more than 1.5 ?m but equal to or less than 2.1 ?m. In this way, it is possible to increase the amount of toner supplied to a development region, and the surface of a photosensitive member is prevented from being scratched by a magnetic brush.
    Type: Application
    Filed: March 1, 2016
    Publication date: February 22, 2018
    Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Yohei ISHIKAWA, Shinya SASAKI
  • Patent number: 9740129
    Abstract: Ferrite particles have, as a main component, a material represented by a composition formula MxFe3?xO4 (where M is at least one type of metal selected from a group made of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0<x<1), where the maximum height Rz of the particles falls within a range of 1.40 ?m to 1.90 ?m, and the degree of distortion Rsk of the particles falls within a range of ?0.25 to ?0.07. In this way, when the ferrite particles are used as the carrier of an electrophotographic image forming apparatus, even if an image formation speed is increased, the occurrence of a failure is reduced for a long period of time.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: August 22, 2017
    Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Shinya Sasaki, Yohei Ishikawa, Haruka Seki
  • Publication number: 20170017433
    Abstract: A storage system capable of realizing off-load data copy among storage subsystems constituting an HA pair configuration is provided. Therefore, in an HA pair configuration where a first volume of a first storage subsystem and a second volume of a second storage subsystem respectively respond a same virtual ID to the host, when the first or the second storage subsystem receives an instruction of off-load data copy specifying a virtual ID as the copy destination from the host computer, either a first volume or a second volume is selected as a copy source volume according to a position of a copy destination volume, and data is copied from the selected copy source volume to the copy destination volume.
    Type: Application
    Filed: June 11, 2014
    Publication date: January 19, 2017
    Inventors: Yohey ISHIKAWA, Hideo SAITO, Tomohiro KAWAGUCHI, Ken TOKORO, Keishi TAMURA, Abhishek JOHRI
  • Publication number: 20170017421
    Abstract: A storage system according to one preferred embodiment of the present invention is composed of at least a first storage subsystem and a second storage subsystem. Write data from a host computer is duplicated to a first volume of the first storage subsystem and a second volume of the second storage subsystem, and the host computer is composed to be able to access both the first volume and the second volume. Attribute information which is information related to an order of write and/or write capability is set for each volume, and when an access command to the volume is received from the host computer, the storage subsystem determines whether I/O to the first volume and/or the second volume is required or not based on the attribute set for each volume.
    Type: Application
    Filed: June 25, 2014
    Publication date: January 19, 2017
    Inventors: Tomohiro TAKEI, Yohey ISHIKAWA, Hideo SAITO, Ken TOKORO, Keishi TAMURA, Tomohiro KAWAGUCHI
  • Publication number: 20160266510
    Abstract: There are provided ferrite particles that have, as a main component, a material represented by a composition formula MxFe3-xO4 (where M is at least one type of metal selected from a group consisting of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0<x<1), where the maximum height Rz of the particles falls within a range of 1.40 to 1.90, and the degree of distortion Rsk of the particles falls within a range of ?0.25 to ?0.07. In this way, when the ferrite particles are used as the carrier of an electrophotographic image forming apparatus, even if an image formation speed is increased, the occurrence of a failure is reduced for a long period of time.
    Type: Application
    Filed: October 29, 2014
    Publication date: September 15, 2016
    Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA IP CREATION CO., LTD.
    Inventors: Shinya SASAKI, Yohei ISHIKAWA, Haruka SEKI
  • Patent number: 9112750
    Abstract: A job management server for managing a plurality of jobs to be executed by a virtual computer generated on a computer, a job management part to manage information on a job net which configures a plurality of jobs and allocate a plurality of jobs included in a job net to the virtual computer, and a recovery part to monitor an execution status of each of the plurality of jobs included in the job net and perform recovery processing, wherein the job management server is configured to: specify a target job for changing allocation, in a case where a failure has occurred in a first virtual computer to execute a first job included in the first job net; determine a performance of a virtual computer required to execute the target job.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: August 18, 2015
    Assignee: HITACHI, LTD.
    Inventor: Yohey Ishikawa